1 /* CC0 (Public domain) - see LICENSE file for details */
8 * BSWAP_16 - reverse bytes in a constant uint16_t value.
9 * @val: constant value whose bytes to swap.
11 * Designed to be usable in constant-requiring initializers.
15 * char buf[BSWAP_16(0x1234)];
18 #define BSWAP_16(val) \
19 ((((uint16_t)(val) & 0x00ff) << 8) \
20 | (((uint16_t)(val) & 0xff00) >> 8))
23 * BSWAP_32 - reverse bytes in a constant uint32_t value.
24 * @val: constant value whose bytes to swap.
26 * Designed to be usable in constant-requiring initializers.
30 * char buf[BSWAP_32(0xff000000)];
33 #define BSWAP_32(val) \
34 ((((uint32_t)(val) & 0x000000ff) << 24) \
35 | (((uint32_t)(val) & 0x0000ff00) << 8) \
36 | (((uint32_t)(val) & 0x00ff0000) >> 8) \
37 | (((uint32_t)(val) & 0xff000000) >> 24))
40 * BSWAP_64 - reverse bytes in a constant uint64_t value.
41 * @val: constantvalue whose bytes to swap.
43 * Designed to be usable in constant-requiring initializers.
47 * char buf[BSWAP_64(0xff00000000000000ULL)];
50 #define BSWAP_64(val) \
51 ((((uint64_t)(val) & 0x00000000000000ffULL) << 56) \
52 | (((uint64_t)(val) & 0x000000000000ff00ULL) << 40) \
53 | (((uint64_t)(val) & 0x0000000000ff0000ULL) << 24) \
54 | (((uint64_t)(val) & 0x00000000ff000000ULL) << 8) \
55 | (((uint64_t)(val) & 0x000000ff00000000ULL) >> 8) \
56 | (((uint64_t)(val) & 0x0000ff0000000000ULL) >> 24) \
57 | (((uint64_t)(val) & 0x00ff000000000000ULL) >> 40) \
58 | (((uint64_t)(val) & 0xff00000000000000ULL) >> 56))
64 * bswap_16 - reverse bytes in a uint16_t value.
65 * @val: value whose bytes to swap.
68 * // Output contains "1024 is 4 as two bytes reversed"
69 * printf("1024 is %u as two bytes reversed\n", bswap_16(1024));
71 static inline uint16_t bswap_16(uint16_t val)
77 * bswap_32 - reverse bytes in a uint32_t value.
78 * @val: value whose bytes to swap.
81 * // Output contains "1024 is 262144 as four bytes reversed"
82 * printf("1024 is %u as four bytes reversed\n", bswap_32(1024));
84 static inline uint32_t bswap_32(uint32_t val)
88 #endif /* !HAVE_BYTESWAP_H */
92 * bswap_64 - reverse bytes in a uint64_t value.
93 * @val: value whose bytes to swap.
96 * // Output contains "1024 is 1125899906842624 as eight bytes reversed"
97 * printf("1024 is %llu as eight bytes reversed\n",
98 * (unsigned long long)bswap_64(1024));
100 static inline uint64_t bswap_64(uint64_t val)
102 return BSWAP_64(val);
106 /* Needed for Glibc like endiness check */
107 #define __LITTLE_ENDIAN 1234
108 #define __BIG_ENDIAN 4321
110 /* Sanity check the defines. We don't handle weird endianness. */
111 #if !HAVE_LITTLE_ENDIAN && !HAVE_BIG_ENDIAN
112 #error "Unknown endian"
113 #elif HAVE_LITTLE_ENDIAN && HAVE_BIG_ENDIAN
114 #error "Can't compile for both big and little endian."
115 #elif HAVE_LITTLE_ENDIAN
117 #define __BYTE_ORDER __LITTLE_ENDIAN
118 #elif __BYTE_ORDER != __LITTLE_ENDIAN
119 #error "__BYTE_ORDER already defined, but not equal to __LITTLE_ENDIAN"
121 #elif HAVE_BIG_ENDIAN
123 #define __BYTE_ORDER __BIG_ENDIAN
124 #elif __BYTE_ORDER != __BIG_ENDIAN
125 #error "__BYTE_ORDER already defined, but not equal to __BIG_ENDIAN"
131 /* sparse needs forcing to remove bitwise attribute from ccan/short_types */
132 #define ENDIAN_CAST __attribute__((force))
133 #define ENDIAN_TYPE __attribute__((bitwise))
139 typedef uint64_t ENDIAN_TYPE leint64_t;
140 typedef uint64_t ENDIAN_TYPE beint64_t;
141 typedef uint32_t ENDIAN_TYPE leint32_t;
142 typedef uint32_t ENDIAN_TYPE beint32_t;
143 typedef uint16_t ENDIAN_TYPE leint16_t;
144 typedef uint16_t ENDIAN_TYPE beint16_t;
146 #if HAVE_LITTLE_ENDIAN
148 * CPU_TO_LE64 - convert a constant uint64_t value to little-endian
149 * @native: constant to convert
151 #define CPU_TO_LE64(native) ((ENDIAN_CAST leint64_t)(native))
154 * CPU_TO_LE32 - convert a constant uint32_t value to little-endian
155 * @native: constant to convert
157 #define CPU_TO_LE32(native) ((ENDIAN_CAST leint32_t)(native))
160 * CPU_TO_LE16 - convert a constant uint16_t value to little-endian
161 * @native: constant to convert
163 #define CPU_TO_LE16(native) ((ENDIAN_CAST leint16_t)(native))
166 * LE64_TO_CPU - convert a little-endian uint64_t constant
167 * @le_val: little-endian constant to convert
169 #define LE64_TO_CPU(le_val) ((ENDIAN_CAST uint64_t)(le_val))
172 * LE32_TO_CPU - convert a little-endian uint32_t constant
173 * @le_val: little-endian constant to convert
175 #define LE32_TO_CPU(le_val) ((ENDIAN_CAST uint32_t)(le_val))
178 * LE16_TO_CPU - convert a little-endian uint16_t constant
179 * @le_val: little-endian constant to convert
181 #define LE16_TO_CPU(le_val) ((ENDIAN_CAST uint16_t)(le_val))
183 #else /* ... HAVE_BIG_ENDIAN */
184 #define CPU_TO_LE64(native) ((ENDIAN_CAST leint64_t)BSWAP_64(native))
185 #define CPU_TO_LE32(native) ((ENDIAN_CAST leint32_t)BSWAP_32(native))
186 #define CPU_TO_LE16(native) ((ENDIAN_CAST leint16_t)BSWAP_16(native))
187 #define LE64_TO_CPU(le_val) BSWAP_64((ENDIAN_CAST uint64_t)le_val)
188 #define LE32_TO_CPU(le_val) BSWAP_32((ENDIAN_CAST uint32_t)le_val)
189 #define LE16_TO_CPU(le_val) BSWAP_16((ENDIAN_CAST uint16_t)le_val)
190 #endif /* HAVE_BIG_ENDIAN */
194 * CPU_TO_BE64 - convert a constant uint64_t value to big-endian
195 * @native: constant to convert
197 #define CPU_TO_BE64(native) ((ENDIAN_CAST beint64_t)(native))
200 * CPU_TO_BE32 - convert a constant uint32_t value to big-endian
201 * @native: constant to convert
203 #define CPU_TO_BE32(native) ((ENDIAN_CAST beint32_t)(native))
206 * CPU_TO_BE16 - convert a constant uint16_t value to big-endian
207 * @native: constant to convert
209 #define CPU_TO_BE16(native) ((ENDIAN_CAST beint16_t)(native))
212 * BE64_TO_CPU - convert a big-endian uint64_t constant
213 * @le_val: big-endian constant to convert
215 #define BE64_TO_CPU(le_val) ((ENDIAN_CAST uint64_t)(le_val))
218 * BE32_TO_CPU - convert a big-endian uint32_t constant
219 * @le_val: big-endian constant to convert
221 #define BE32_TO_CPU(le_val) ((ENDIAN_CAST uint32_t)(le_val))
224 * BE16_TO_CPU - convert a big-endian uint16_t constant
225 * @le_val: big-endian constant to convert
227 #define BE16_TO_CPU(le_val) ((ENDIAN_CAST uint16_t)(le_val))
229 #else /* ... HAVE_LITTLE_ENDIAN */
230 #define CPU_TO_BE64(native) ((ENDIAN_CAST beint64_t)BSWAP_64(native))
231 #define CPU_TO_BE32(native) ((ENDIAN_CAST beint32_t)BSWAP_32(native))
232 #define CPU_TO_BE16(native) ((ENDIAN_CAST beint16_t)BSWAP_16(native))
233 #define BE64_TO_CPU(le_val) BSWAP_64((ENDIAN_CAST uint64_t)le_val)
234 #define BE32_TO_CPU(le_val) BSWAP_32((ENDIAN_CAST uint32_t)le_val)
235 #define BE16_TO_CPU(le_val) BSWAP_16((ENDIAN_CAST uint16_t)le_val)
236 #endif /* HAVE_LITTE_ENDIAN */
240 * cpu_to_le64 - convert a uint64_t value to little-endian
241 * @native: value to convert
243 static inline leint64_t cpu_to_le64(uint64_t native)
245 return CPU_TO_LE64(native);
249 * cpu_to_le32 - convert a uint32_t value to little-endian
250 * @native: value to convert
252 static inline leint32_t cpu_to_le32(uint32_t native)
254 return CPU_TO_LE32(native);
258 * cpu_to_le16 - convert a uint16_t value to little-endian
259 * @native: value to convert
261 static inline leint16_t cpu_to_le16(uint16_t native)
263 return CPU_TO_LE16(native);
267 * le64_to_cpu - convert a little-endian uint64_t value
268 * @le_val: little-endian value to convert
270 static inline uint64_t le64_to_cpu(leint64_t le_val)
272 return LE64_TO_CPU(le_val);
276 * le32_to_cpu - convert a little-endian uint32_t value
277 * @le_val: little-endian value to convert
279 static inline uint32_t le32_to_cpu(leint32_t le_val)
281 return LE32_TO_CPU(le_val);
285 * le16_to_cpu - convert a little-endian uint16_t value
286 * @le_val: little-endian value to convert
288 static inline uint16_t le16_to_cpu(leint16_t le_val)
290 return LE16_TO_CPU(le_val);
294 * cpu_to_be64 - convert a uint64_t value to big endian.
295 * @native: value to convert
297 static inline beint64_t cpu_to_be64(uint64_t native)
299 return CPU_TO_BE64(native);
303 * cpu_to_be32 - convert a uint32_t value to big endian.
304 * @native: value to convert
306 static inline beint32_t cpu_to_be32(uint32_t native)
308 return CPU_TO_BE32(native);
312 * cpu_to_be16 - convert a uint16_t value to big endian.
313 * @native: value to convert
315 static inline beint16_t cpu_to_be16(uint16_t native)
317 return CPU_TO_BE16(native);
321 * be64_to_cpu - convert a big-endian uint64_t value
322 * @be_val: big-endian value to convert
324 static inline uint64_t be64_to_cpu(beint64_t be_val)
326 return BE64_TO_CPU(be_val);
330 * be32_to_cpu - convert a big-endian uint32_t value
331 * @be_val: big-endian value to convert
333 static inline uint32_t be32_to_cpu(beint32_t be_val)
335 return BE32_TO_CPU(be_val);
339 * be16_to_cpu - convert a big-endian uint16_t value
340 * @be_val: big-endian value to convert
342 static inline uint16_t be16_to_cpu(beint16_t be_val)
344 return BE16_TO_CPU(be_val);
347 /* Whichever they include first, they get these definitions. */
348 #ifdef CCAN_SHORT_TYPES_H
350 * be64/be32/be16 - 64/32/16 bit big-endian representation.
352 typedef beint64_t be64;
353 typedef beint32_t be32;
354 typedef beint16_t be16;
357 * le64/le32/le16 - 64/32/16 bit little-endian representation.
359 typedef leint64_t le64;
360 typedef leint32_t le32;
361 typedef leint16_t le16;
363 #endif /* CCAN_ENDIAN_H */